[Bug 755680] DVD navigation not working?

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755680

--- Comment #4 from Jan Schmidt <thaytan at noraisin.net> ---
The problem here is around the pipeline not prerolling. The presentation starts
with a still frame plus audio track, and we don't handle it right - the audio
chain is never prerolled. There's no data, but also not enough empty space
before the still frame to trigger a GAP and cause preroll.

I could make the mpeg demuxer generate gap events to bring all pads up to the
start of the still event, which would probably do get it to preroll.

The reason the buttons aren't clickable is that we don't schedule and activate
PCI packets until the clock starts running - so we need to preroll. That could
also be worked around - when activating a still frame in PAUSED, advance the
PCI data to running time of the still frame.

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